Project description:We investigated the combined effects of H4K16 acylations in vivo using a mouse model of short-chain acyl-CoA dehydrogenase deficiency (SCADD), which causes metabolic challenges and systemic shifts in acyl-CoA ratios. Our findings indicate that H4K16 acylations modulate transcriptional responses in a concerted manner, providing insights into an adaptive chromatin regulation in response to metabolic stress.
Project description:We investigated the combined effects of H4K16 acylations in vivo using a mouse model of short-chain acyl-CoA dehydrogenase deficiency (SCADD), which causes metabolic challenges and systemic shifts in acyl-CoA ratios. Our findings indicate that H4K16 acylations modulate transcriptional responses in a concerted manner, providing insights into an adaptive chromatin regulation in response to metabolic stress.
Project description:We investigated the combined effects of H4K16 acylations in vivo using a mouse model of short-chain acyl-CoA dehydrogenase deficiency (SCADD), which causes metabolic challenges and systemic shifts in acyl-CoA ratios. Our findings indicate that H4K16 acylations modulate transcriptional responses in a concerted manner, providing insights into an adaptive chromatin regulation in response to metabolic stress.
Project description:full title: A mitochondrial long-chain fatty acid oxidation defect in a mouse model leads to dysregulation of plasma long-chain acylcarnitines, dysregulation of plasma amino acids, and an increased reliance on glucocorticoid signaling to maintain euglycemia during fasting. [liver] The liver is a major source of energy substrates during metabolic stress: fasting, prolonged exercise, febrile illness. Fasting-induced hypoglycemia is a characteristic feature of FAO disorders including very long chain acyl-CoA dehydrogenase (VLCAD) deficiency (VLCADD). However, the pathophysiological mechanisms that underlie the diversity of clinical presentation of FAO dysfunction are not known. Here, we investigated the transcriptional response in liver tissue to the FAO defect in a model of VLCADD: the long-chain acyl-CoA dehydrogenase (LCAD) knockout (KO) mouse. We found that differentially expressed genes from the liver were associated with molecular networks annotated for fatty acid oxidation and cholesterol biosynthesis from population-based networks.
Project description:ETFDH (electron transfer flavoprotein ubiquinone oxidoreductase) is a 64 kDa protein monomer located in the inner mitochondrial membrane, in charge of transferring the electrons received from the electron transfer flavoprotein ETF to the Coenzyme Q (Q). Pathological mutations in ETFDH lead to Multiple Acyl-CoA Dehydrogenase Deficiency (MADD; OMIM #231680). C2C12 cells lacking ETFDH were analysed by TMT analysis and compared to wt cells.
Project description:A mitochondrial long-chain fatty acid oxidation defect leads to dysregulation of plasma long-chain acyl carnitines, dysregulation of plasma amino acids, and an increased reliance on glucocorticoid signaling to maintain euglycemia during fasting. [muscle] Skeletal muscle tissue relies on products of fatty acid oxidation (FAO) during conditions of metabolic stress: fasting, prolonged exercise, febrile illness. Fasting-induced hypoglycemia and rhabdomyolysis are characteristic features of FAO disorders including very long chain acyl-CoA dehydrogenase (VLCAD) deficiency (VLCADD). However, the pathophysiological mechanisms that underlie the connection between FAO dysfunction and skeletal muscle dysfunction are not known. Here, we investigated the transcriptional response in skeletal muscle tissue (gastrocnemius) to the FAO defect in a model of VLCADD: the long-chain acyl-CoA dehydrogenase (LCAD) knockout (KO) mouse. We found that differentially expressed genes in the muscle were associated with molecular networks annotated for the cellular response to starvation from population-based models. To validate the association between the starvation response and FAO, we pharmacologically inhibited both glucocorticoid signaling and FAO in a model of fasting and observed that mice depleted in both pathways lost less weight during fasting and became hypoglycemic. These findings implicate glucocorticoid signaling as a candidate modifier of the cellular response to starvation in muscle tissue in the context of FAO disorders including VLCADD.
Project description:<p>Mitochondrial electron transport flavoprotein (ETF) insufficiency causes metabolic diseases known as a multiple acyl-CoA dehydrogenase deficiency (MADD). Although essential in muscle, we identified ETF dehydrogenase (ETFDH) as one of the most dispensable metabolic genes in neoplasia, and its expression is reduced across human cancers. ETF insufficiency caused by decreased ETFDH expression limits flexibility of OXPHOS fuel utilization, but paradoxically increases cancer cell bioenergetics and accelerates neoplastic growth by retrograde activation of the mTORC1/BCL-6/4E-BP1 axis. Collectively, these findings reveal that while ETF insufficiency is rare and has detrimental effects in non-malignant tissues, it is common in neoplasia, where ETFDH downregulation leads to bioenergetic and signaling reprogramming that accelerate neoplastic growth.</p>
